- The air pollution is terrible.  
- It will be worse ________ we take action to protect the environment.
A．ifB．unlessC．untilD．when
B

試題分析：句意：—空氣污染很嚴重。 —情況將會更加嚴重，除非我們采取措施來保護環(huán)境。A. if如果； B. unless除非，如果不；C. until直到……才；D. when當……的時候。句意和詞意結合可知，選B。
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